Extang Toolbox Tonneau Covers

"If you have a toolbox in your truck, complete the upgrade with a toolbox tonneau cover. Select from 5 different styles to fit your needs. Extang toolbox tonneau covers are specifically designed for your truck and most standard 18"-20" toolboxes. Each cover comes with a specially designed "L" shaped rail that mounts up against your supplied toolbox without drilling or tape. The included seal helps keep water out."